fio.c

   1 /*
   2  * fio - the flexible io tester
   3  *
   4  * Copyright (C) 2005 Jens Axboe <axboe@suse.de>
   5  * Copyright (C) 2006 Jens Axboe <axboe@kernel.dk>
   6  *
   7  * The license below covers all files distributed with fio unless otherwise
   8  * noted in the file itself.
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License version 2 as
  12  *  published by the Free Software Foundation.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  */
  24 #include <unistd.h>
  25 #include <fcntl.h>
  26 #include <string.h>
  27 #include <signal.h>
  28 #include <time.h>
  29 #include <locale.h>
  30 #include <assert.h>
  31 #include <sys/stat.h>
  32 #include <sys/wait.h>
  33 #include <sys/ipc.h>
  34 #include <sys/shm.h>
  35 #include <sys/mman.h>
  36
  37 #include "fio.h"
  38 #include "hash.h"
  39 #include "smalloc.h"
  40
  41 unsigned long page_mask;
  42 unsigned long page_size;
  43 #define ALIGN(buf)      \
  44         (char *) (((unsigned long) (buf) + page_mask) & ~page_mask)
  45
  46 int groupid = 0;
  47 int thread_number = 0;
  48 int nr_process = 0;
  49 int nr_thread = 0;
  50 int shm_id = 0;
  51 int temp_stall_ts;
  52 unsigned long done_secs = 0;
  53
  54 static struct fio_mutex *startup_mutex;
  55 static volatile int fio_abort;
  56 static int exit_value;
  57 static struct itimerval itimer;
  58 static pthread_t gtod_thread;
  59
  60 struct io_log *agg_io_log[2];
  61
  62 #define TERMINATE_ALL           (-1)
  63 #define JOB_START_TIMEOUT       (5 * 1000)
  64
  65 void td_set_runstate(struct thread_data *td, int runstate)
  66 {
  67         if (td->runstate == runstate)
  68                 return;
  69
  70         dprint(FD_PROCESS, "pid=%d: runstate %d -> %d\n", (int) td->pid,
  71                                                 td->runstate, runstate);
  72         td->runstate = runstate;
  73 }
  74
  75 static void terminate_threads(int group_id)
  76 {
  77         struct thread_data *td;
  78         int i;
  79
  80         dprint(FD_PROCESS, "terminate group_id=%d\n", group_id);
  81
  82         for_each_td(td, i) {
  83                 if (group_id == TERMINATE_ALL || groupid == td->groupid) {
  84                         dprint(FD_PROCESS, "setting terminate on %s/%d\n",
  85                                                 td->o.name, (int) td->pid);
  86                         td->terminate = 1;
  87                         td->o.start_delay = 0;
  88
  89                         /*
  90                          * if the thread is running, just let it exit
  91                          */
  92                         if (td->runstate < TD_RUNNING)
  93                                 kill(td->pid, SIGQUIT);
  94                         else {
  95                                 struct ioengine_ops *ops = td->io_ops;
  96
  97                                 if (ops && (ops->flags & FIO_SIGQUIT))
  98                                         kill(td->pid, SIGQUIT);
  99                         }
 100                 }
 101         }
 102 }
 103
 104 static void status_timer_arm(void)
 105 {
 106         itimer.it_value.tv_sec = 0;
 107         itimer.it_value.tv_usec = DISK_UTIL_MSEC * 1000;
 108         setitimer(ITIMER_REAL, &itimer, NULL);
 109 }
 110
 111 static void sig_alrm(int fio_unused sig)
 112 {
 113         if (threads) {
 114                 update_io_ticks();
 115                 print_thread_status();
 116                 status_timer_arm();
 117         }
 118 }
 119
 120 /*
 121  * Happens on thread runs with ctrl-c, ignore our own SIGQUIT
 122  */
 123 static void sig_quit(int sig)
 124 {
 125 }
 126
 127 static void sig_int(int sig)
 128 {
 129         if (threads) {
 130                 printf("\nfio: terminating on signal %d\n", sig);
 131                 fflush(stdout);
 132                 terminate_threads(TERMINATE_ALL);
 133         }
 134 }
 135
 136 static void sig_ill(int fio_unused sig)
 137 {
 138         if (!threads)
 139                 return;
 140
 141         log_err("fio: illegal instruction. your cpu does not support "
 142                 "the sse4.2 instruction for crc32c\n");
 143         terminate_threads(TERMINATE_ALL);
 144         exit(4);
 145 }
 146
 147 static void set_sig_handlers(void)
 148 {
 149         struct sigaction act;
 150
 151         memset(&act, 0, sizeof(act));
 152         act.sa_handler = sig_alrm;
 153         act.sa_flags = SA_RESTART;
 154         sigaction(SIGALRM, &act, NULL);
 155
 156         memset(&act, 0, sizeof(act));
 157         act.sa_handler = sig_int;
 158         act.sa_flags = SA_RESTART;
 159         sigaction(SIGINT, &act, NULL);
 160
 161         memset(&act, 0, sizeof(act));
 162         act.sa_handler = sig_ill;
 163         act.sa_flags = SA_RESTART;
 164         sigaction(SIGILL, &act, NULL);
 165
 166         memset(&act, 0, sizeof(act));
 167         act.sa_handler = sig_quit;
 168         act.sa_flags = SA_RESTART;
 169         sigaction(SIGQUIT, &act, NULL);
 170 }
 171
 172 static inline int should_check_rate(struct thread_data *td)
 173 {
 174         /*
 175          * No minimum rate set, always ok
 176          */
 177         if (!td->o.ratemin && !td->o.rate_iops_min)
 178                 return 0;
 179
 180         return 1;
 181 }
 182
 183 /*
 184  * Check if we are above the minimum rate given.
 185  */
 186 static int check_min_rate(struct thread_data *td, struct timeval *now)
 187 {
 188         unsigned long long bytes = 0;
 189         unsigned long iops = 0;
 190         unsigned long spent;
 191         unsigned long rate;
 192
 193         /*
 194          * allow a 2 second settle period in the beginning
 195          */
 196         if (mtime_since(&td->start, now) < 2000)
 197                 return 0;
 198
 199         if (td_read(td)) {
 200                 iops += td->io_blocks[DDIR_READ];
 201                 bytes += td->this_io_bytes[DDIR_READ];
 202         }
 203         if (td_write(td)) {
 204                 iops += td->io_blocks[DDIR_WRITE];
 205                 bytes += td->this_io_bytes[DDIR_WRITE];
 206         }
 207
 208         /*
 209          * if rate blocks is set, sample is running
 210          */
 211         if (td->rate_bytes || td->rate_blocks) {
 212                 spent = mtime_since(&td->lastrate, now);
 213                 if (spent < td->o.ratecycle)
 214                         return 0;
 215
 216                 if (td->o.rate) {
 217                         /*
 218                          * check bandwidth specified rate
 219                          */
 220                         if (bytes < td->rate_bytes) {
 221                                 log_err("%s: min rate %u not met\n", td->o.name,
 222                                                                 td->o.ratemin);
 223                                 return 1;
 224                         } else {
 225                                 rate = (bytes - td->rate_bytes) / spent;
 226                                 if (rate < td->o.ratemin ||
 227                                     bytes < td->rate_bytes) {
 228                                         log_err("%s: min rate %u not met, got"
 229                                                 " %luKiB/sec\n", td->o.name,
 230                                                         td->o.ratemin, rate);
 231                                         return 1;
 232                                 }
 233                         }
 234                 } else {
 235                         /*
 236                          * checks iops specified rate
 237                          */
 238                         if (iops < td->o.rate_iops) {
 239                                 log_err("%s: min iops rate %u not met\n",
 240                                                 td->o.name, td->o.rate_iops);
 241                                 return 1;
 242                         } else {
 243                                 rate = (iops - td->rate_blocks) / spent;
 244                                 if (rate < td->o.rate_iops_min ||
 245                                     iops < td->rate_blocks) {
 246                                         log_err("%s: min iops rate %u not met,"
 247                                                 " got %lu\n", td->o.name,
 248                                                         td->o.rate_iops_min,
 249                                                         rate);
 250                                 }
 251                         }
 252                 }
 253         }
 254
 255         td->rate_bytes = bytes;
 256         td->rate_blocks = iops;
 257         memcpy(&td->lastrate, now, sizeof(*now));
 258         return 0;
 259 }
 260
 261 static inline int runtime_exceeded(struct thread_data *td, struct timeval *t)
 262 {
 263         if (!td->o.timeout)
 264                 return 0;
 265         if (mtime_since(&td->epoch, t) >= td->o.timeout * 1000)
 266                 return 1;
 267
 268         return 0;
 269 }
 270
 271 /*
 272  * When job exits, we can cancel the in-flight IO if we are using async
 273  * io. Attempt to do so.
 274  */
 275 static void cleanup_pending_aio(struct thread_data *td)
 276 {
 277         struct flist_head *entry, *n;
 278         struct io_u *io_u;
 279         int r;
 280
 281         /*
 282          * get immediately available events, if any
 283          */
 284         r = io_u_queued_complete(td, 0);
 285         if (r < 0)
 286                 return;
 287
 288         /*
 289          * now cancel remaining active events
 290          */
 291         if (td->io_ops->cancel) {
 292                 flist_for_each_safe(entry, n, &td->io_u_busylist) {
 293                         io_u = flist_entry(entry, struct io_u, list);
 294
 295                         /*
 296                          * if the io_u isn't in flight, then that generally
 297                          * means someone leaked an io_u. complain but fix
 298                          * it up, so we don't stall here.
 299                          */
 300                         if ((io_u->flags & IO_U_F_FLIGHT) == 0) {
 301                                 log_err("fio: non-busy IO on busy list\n");
 302                                 put_io_u(td, io_u);
 303                         } else {
 304                                 r = td->io_ops->cancel(td, io_u);
 305                                 if (!r)
 306                                         put_io_u(td, io_u);
 307                         }
 308                 }
 309         }
 310
 311         if (td->cur_depth)
 312                 r = io_u_queued_complete(td, td->cur_depth);
 313 }
 314
 315 /*
 316  * Helper to handle the final sync of a file. Works just like the normal
 317  * io path, just does everything sync.
 318  */
 319 static int fio_io_sync(struct thread_data *td, struct fio_file *f)
 320 {
 321         struct io_u *io_u = __get_io_u(td);
 322         int ret;
 323
 324         if (!io_u)
 325                 return 1;
 326
 327         io_u->ddir = DDIR_SYNC;
 328         io_u->file = f;
 329
 330         if (td_io_prep(td, io_u)) {
 331                 put_io_u(td, io_u);
 332                 return 1;
 333         }
 334
 335 requeue:
 336         ret = td_io_queue(td, io_u);
 337         if (ret < 0) {
 338                 td_verror(td, io_u->error, "td_io_queue");
 339                 put_io_u(td, io_u);
 340                 return 1;
 341         } else if (ret == FIO_Q_QUEUED) {
 342                 if (io_u_queued_complete(td, 1) < 0)
 343                         return 1;
 344         } else if (ret == FIO_Q_COMPLETED) {
 345                 if (io_u->error) {
 346                         td_verror(td, io_u->error, "td_io_queue");
 347                         return 1;
 348                 }
 349
 350                 if (io_u_sync_complete(td, io_u) < 0)
 351                         return 1;
 352         } else if (ret == FIO_Q_BUSY) {
 353                 if (td_io_commit(td))
 354                         return 1;
 355                 goto requeue;
 356         }
 357
 358         return 0;
 359 }
 360
 361 static inline void update_tv_cache(struct thread_data *td)
 362 {
 363         if ((++td->tv_cache_nr & td->tv_cache_mask) == td->tv_cache_mask)
 364                 fio_gettime(&td->tv_cache, NULL);
 365 }
 366
 367 /*
 368  * The main verify engine. Runs over the writes we previously submitted,
 369  * reads the blocks back in, and checks the crc/md5 of the data.
 370  */
 371 static void do_verify(struct thread_data *td)
 372 {
 373         struct fio_file *f;
 374         struct io_u *io_u;
 375         int ret, min_events;
 376         unsigned int i;
 377
 378         /*
 379          * sync io first and invalidate cache, to make sure we really
 380          * read from disk.
 381          */
 382         for_each_file(td, f, i) {
 383                 if (!(f->flags & FIO_FILE_OPEN))
 384                         continue;
 385                 if (fio_io_sync(td, f))
 386                         break;
 387                 if (file_invalidate_cache(td, f))
 388                         break;
 389         }
 390
 391         if (td->error)
 392                 return;
 393
 394         td_set_runstate(td, TD_VERIFYING);
 395
 396         io_u = NULL;
 397         while (!td->terminate) {
 398                 int ret2, full;
 399
 400                 io_u = __get_io_u(td);
 401                 if (!io_u)
 402                         break;
 403
 404                 update_tv_cache(td);
 405
 406                 if (runtime_exceeded(td, &td->tv_cache)) {
 407                         put_io_u(td, io_u);
 408                         td->terminate = 1;
 409                         break;
 410                 }
 411
 412                 if (get_next_verify(td, io_u)) {
 413                         put_io_u(td, io_u);
 414                         break;
 415                 }
 416
 417                 if (td_io_prep(td, io_u)) {
 418                         put_io_u(td, io_u);
 419                         break;
 420                 }
 421
 422                 io_u->end_io = verify_io_u;
 423
 424                 ret = td_io_queue(td, io_u);
 425                 switch (ret) {
 426                 case FIO_Q_COMPLETED:
 427                         if (io_u->error)
 428                                 ret = -io_u->error;
 429                         else if (io_u->resid) {
 430                                 int bytes = io_u->xfer_buflen - io_u->resid;
 431                                 struct fio_file *f = io_u->file;
 432
 433                                 /*
 434                                  * zero read, fail
 435                                  */
 436                                 if (!bytes) {
 437                                         td_verror(td, EIO, "full resid");
 438                                         put_io_u(td, io_u);
 439                                         break;
 440                                 }
 441
 442                                 io_u->xfer_buflen = io_u->resid;
 443                                 io_u->xfer_buf += bytes;
 444                                 io_u->offset += bytes;
 445
 446                                 td->ts.short_io_u[io_u->ddir]++;
 447
 448                                 if (io_u->offset == f->real_file_size)
 449                                         goto sync_done;
 450
 451                                 requeue_io_u(td, &io_u);
 452                         } else {
 453 sync_done:
 454                                 ret = io_u_sync_complete(td, io_u);
 455                                 if (ret < 0)
 456                                         break;
 457                         }
 458                         continue;
 459                 case FIO_Q_QUEUED:
 460                         break;
 461                 case FIO_Q_BUSY:
 462                         requeue_io_u(td, &io_u);
 463                         ret2 = td_io_commit(td);
 464                         if (ret2 < 0)
 465                                 ret = ret2;
 466                         break;
 467                 default:
 468                         assert(ret < 0);
 469                         td_verror(td, -ret, "td_io_queue");
 470                         break;
 471                 }
 472
 473                 if (ret < 0 || td->error)
 474                         break;
 475
 476                 /*
 477                  * if we can queue more, do so. but check if there are
 478                  * completed io_u's first.
 479                  */
 480                 full = queue_full(td) || ret == FIO_Q_BUSY;
 481                 if (full || !td->o.iodepth_batch_complete) {
 482                         min_events = td->o.iodepth_batch_complete;
 483                         if (full && !min_events)
 484                                 min_events = 1;
 485
 486                         do {
 487                                 /*
 488                                  * Reap required number of io units, if any,
 489                                  * and do the verification on them through
 490                                  * the callback handler
 491                                  */
 492                                 if (io_u_queued_complete(td, min_events) < 0) {
 493                                         ret = -1;
 494                                         break;
 495                                 }
 496                         } while (full && (td->cur_depth > td->o.iodepth_low));
 497                 }
 498                 if (ret < 0)
 499                         break;
 500         }
 501
 502         if (!td->error) {
 503                 min_events = td->cur_depth;
 504
 505                 if (min_events)
 506                         ret = io_u_queued_complete(td, min_events);
 507         } else
 508                 cleanup_pending_aio(td);
 509
 510         td_set_runstate(td, TD_RUNNING);
 511 }
 512
 513 /*
 514  * Main IO worker function. It retrieves io_u's to process and queues
 515  * and reaps them, checking for rate and errors along the way.
 516  */
 517 static void do_io(struct thread_data *td)
 518 {
 519         unsigned long usec;
 520         unsigned int i;
 521         int ret = 0;
 522
 523         if (in_ramp_time(td))
 524                 td_set_runstate(td, TD_RAMP);
 525         else
 526                 td_set_runstate(td, TD_RUNNING);
 527
 528         while ((td->this_io_bytes[0] + td->this_io_bytes[1]) < td->o.size) {
 529                 struct timeval comp_time;
 530                 long bytes_done = 0;
 531                 int min_evts = 0;
 532                 struct io_u *io_u;
 533                 int ret2, full;
 534
 535                 if (td->terminate)
 536                         break;
 537
 538                 io_u = get_io_u(td);
 539                 if (!io_u)
 540                         break;
 541
 542                 update_tv_cache(td);
 543
 544                 if (runtime_exceeded(td, &td->tv_cache)) {
 545                         put_io_u(td, io_u);
 546                         td->terminate = 1;
 547                         break;
 548                 }
 549
 550                 /*
 551                  * Add verification end_io handler, if asked to verify
 552                  * a previously written file.
 553                  */
 554                 if (td->o.verify != VERIFY_NONE && io_u->ddir == DDIR_READ) {
 555                         io_u->end_io = verify_io_u;
 556                         td_set_runstate(td, TD_VERIFYING);
 557                 } else if (in_ramp_time(td))
 558                         td_set_runstate(td, TD_RAMP);
 559                 else
 560                         td_set_runstate(td, TD_RUNNING);
 561
 562                 ret = td_io_queue(td, io_u);
 563                 switch (ret) {
 564                 case FIO_Q_COMPLETED:
 565                         if (io_u->error)
 566                                 ret = -io_u->error;
 567                         else if (io_u->resid) {
 568                                 int bytes = io_u->xfer_buflen - io_u->resid;
 569                                 struct fio_file *f = io_u->file;
 570
 571                                 /*
 572                                  * zero read, fail
 573                                  */
 574                                 if (!bytes) {
 575                                         td_verror(td, EIO, "full resid");
 576                                         put_io_u(td, io_u);
 577                                         break;
 578                                 }
 579
 580                                 io_u->xfer_buflen = io_u->resid;
 581                                 io_u->xfer_buf += bytes;
 582                                 io_u->offset += bytes;
 583
 584                                 td->ts.short_io_u[io_u->ddir]++;
 585
 586                                 if (io_u->offset == f->real_file_size)
 587                                         goto sync_done;
 588
 589                                 requeue_io_u(td, &io_u);
 590                         } else {
 591 sync_done:
 592                                 if (should_check_rate(td))
 593                                         fio_gettime(&comp_time, NULL);
 594
 595                                 bytes_done = io_u_sync_complete(td, io_u);
 596                                 if (bytes_done < 0)
 597                                         ret = bytes_done;
 598                         }
 599                         break;
 600                 case FIO_Q_QUEUED:
 601                         /*
 602                          * if the engine doesn't have a commit hook,
 603                          * the io_u is really queued. if it does have such
 604                          * a hook, it has to call io_u_queued() itself.
 605                          */
 606                         if (td->io_ops->commit == NULL)
 607                                 io_u_queued(td, io_u);
 608                         break;
 609                 case FIO_Q_BUSY:
 610                         requeue_io_u(td, &io_u);
 611                         ret2 = td_io_commit(td);
 612                         if (ret2 < 0)
 613                                 ret = ret2;
 614                         break;
 615                 default:
 616                         assert(ret < 0);
 617                         put_io_u(td, io_u);
 618                         break;
 619                 }
 620
 621                 if (ret < 0 || td->error)
 622                         break;
 623
 624                 /*
 625                  * See if we need to complete some commands
 626                  */
 627                 full = queue_full(td) || ret == FIO_Q_BUSY;
 628                 if (full || !td->o.iodepth_batch_complete) {
 629                         min_evts = td->o.iodepth_batch_complete;
 630                         if (full && !min_evts)
 631                                 min_evts = 1;
 632
 633                         if (should_check_rate(td))
 634                                 fio_gettime(&comp_time, NULL);
 635
 636                         do {
 637                                 ret = io_u_queued_complete(td, min_evts);
 638                                 if (ret <= 0)
 639                                         break;
 640
 641                                 bytes_done += ret;
 642                         } while (full && (td->cur_depth > td->o.iodepth_low));
 643                 }
 644
 645                 if (ret < 0)
 646                         break;
 647                 if (!bytes_done)
 648                         continue;
 649
 650                 /*
 651                  * the rate is batched for now, it should work for batches
 652                  * of completions except the very first one which may look
 653                  * a little bursty
 654                  */
 655                 if (!in_ramp_time(td) && should_check_rate(td)) {
 656                         usec = utime_since(&td->tv_cache, &comp_time);
 657
 658                         rate_throttle(td, usec, bytes_done);
 659
 660                         if (check_min_rate(td, &comp_time)) {
 661                                 if (exitall_on_terminate)
 662                                         terminate_threads(td->groupid);
 663                                 td_verror(td, EIO, "check_min_rate");
 664                                 break;
 665                         }
 666                 }
 667
 668                 if (td->o.thinktime) {
 669                         unsigned long long b;
 670
 671                         b = td->io_blocks[0] + td->io_blocks[1];
 672                         if (!(b % td->o.thinktime_blocks)) {
 673                                 int left;
 674
 675                                 if (td->o.thinktime_spin)
 676                                         usec_spin(td->o.thinktime_spin);
 677
 678                                 left = td->o.thinktime - td->o.thinktime_spin;
 679                                 if (left)
 680                                         usec_sleep(td, left);
 681                         }
 682                 }
 683         }
 684
 685         if (td->o.fill_device && td->error == ENOSPC) {
 686                 td->error = 0;
 687                 td->terminate = 1;
 688         }
 689         if (!td->error) {
 690                 struct fio_file *f;
 691
 692                 i = td->cur_depth;
 693                 if (i)
 694                         ret = io_u_queued_complete(td, i);
 695
 696                 if (should_fsync(td) && td->o.end_fsync) {
 697                         td_set_runstate(td, TD_FSYNCING);
 698
 699                         for_each_file(td, f, i) {
 700                                 if (!(f->flags & FIO_FILE_OPEN))
 701                                         continue;
 702                                 fio_io_sync(td, f);
 703                         }
 704                 }
 705         } else
 706                 cleanup_pending_aio(td);
 707
 708         /*
 709          * stop job if we failed doing any IO
 710          */
 711         if ((td->this_io_bytes[0] + td->this_io_bytes[1]) == 0)
 712                 td->done = 1;
 713 }
 714
 715 static void cleanup_io_u(struct thread_data *td)
 716 {
 717         struct flist_head *entry, *n;
 718         struct io_u *io_u;
 719
 720         flist_for_each_safe(entry, n, &td->io_u_freelist) {
 721                 io_u = flist_entry(entry, struct io_u, list);
 722
 723                 flist_del(&io_u->list);
 724                 free(io_u);
 725         }
 726
 727         free_io_mem(td);
 728 }
 729
 730 static int init_io_u(struct thread_data *td)
 731 {
 732         struct io_u *io_u;
 733         unsigned int max_bs;
 734         int i, max_units;
 735         char *p;
 736
 737         max_units = td->o.iodepth;
 738         max_bs = max(td->o.max_bs[DDIR_READ], td->o.max_bs[DDIR_WRITE]);
 739         td->orig_buffer_size = (unsigned long long) max_bs
 740                                         * (unsigned long long) max_units;
 741
 742         if (td->o.mem_type == MEM_SHMHUGE || td->o.mem_type == MEM_MMAPHUGE) {
 743                 unsigned long bs;
 744
 745                 bs = td->orig_buffer_size + td->o.hugepage_size - 1;
 746                 td->orig_buffer_size = bs & ~(td->o.hugepage_size - 1);
 747         }
 748
 749         if (td->orig_buffer_size != (size_t) td->orig_buffer_size) {
 750                 log_err("fio: IO memory too large. Reduce max_bs or iodepth\n");
 751                 return 1;
 752         }
 753
 754         if (allocate_io_mem(td))
 755                 return 1;
 756
 757         if (td->o.odirect)
 758                 p = ALIGN(td->orig_buffer);
 759         else
 760                 p = td->orig_buffer;
 761
 762         for (i = 0; i < max_units; i++) {
 763                 if (td->terminate)
 764                         return 1;
 765                 io_u = malloc(sizeof(*io_u));
 766                 memset(io_u, 0, sizeof(*io_u));
 767                 INIT_FLIST_HEAD(&io_u->list);
 768
 769                 if (!(td->io_ops->flags & FIO_NOIO)) {
 770                         io_u->buf = p + max_bs * i;
 771
 772                         if (td_write(td) && !td->o.refill_buffers)
 773                                 io_u_fill_buffer(td, io_u, max_bs);
 774                 }
 775
 776                 io_u->index = i;
 777                 io_u->flags = IO_U_F_FREE;
 778                 flist_add(&io_u->list, &td->io_u_freelist);
 779         }
 780
 781         return 0;
 782 }
 783
 784 static int switch_ioscheduler(struct thread_data *td)
 785 {
 786         char tmp[256], tmp2[128];
 787         FILE *f;
 788         int ret;
 789
 790         if (td->io_ops->flags & FIO_DISKLESSIO)
 791                 return 0;
 792
 793         sprintf(tmp, "%s/queue/scheduler", td->sysfs_root);
 794
 795         f = fopen(tmp, "r+");
 796         if (!f) {
 797                 if (errno == ENOENT) {
 798                         log_err("fio: os or kernel doesn't support IO scheduler"
 799                                 " switching\n");
 800                         return 0;
 801                 }
 802                 td_verror(td, errno, "fopen iosched");
 803                 return 1;
 804         }
 805
 806         /*
 807          * Set io scheduler.
 808          */
 809         ret = fwrite(td->o.ioscheduler, strlen(td->o.ioscheduler), 1, f);
 810         if (ferror(f) || ret != 1) {
 811                 td_verror(td, errno, "fwrite");
 812                 fclose(f);
 813                 return 1;
 814         }
 815
 816         rewind(f);
 817
 818         /*
 819          * Read back and check that the selected scheduler is now the default.
 820          */
 821         ret = fread(tmp, 1, sizeof(tmp), f);
 822         if (ferror(f) || ret < 0) {
 823                 td_verror(td, errno, "fread");
 824                 fclose(f);
 825                 return 1;
 826         }
 827
 828         sprintf(tmp2, "[%s]", td->o.ioscheduler);
 829         if (!strstr(tmp, tmp2)) {
 830                 log_err("fio: io scheduler %s not found\n", td->o.ioscheduler);
 831                 td_verror(td, EINVAL, "iosched_switch");
 832                 fclose(f);
 833                 return 1;
 834         }
 835
 836         fclose(f);
 837         return 0;
 838 }
 839
 840 static int keep_running(struct thread_data *td)
 841 {
 842         unsigned long long io_done;
 843
 844         if (td->done)
 845                 return 0;
 846         if (td->o.time_based)
 847                 return 1;
 848         if (td->o.loops) {
 849                 td->o.loops--;
 850                 return 1;
 851         }
 852
 853         io_done = td->io_bytes[DDIR_READ] + td->io_bytes[DDIR_WRITE]
 854                         + td->io_skip_bytes;
 855         if (io_done < td->o.size)
 856                 return 1;
 857
 858         return 0;
 859 }
 860
 861 static void reset_io_counters(struct thread_data *td)
 862 {
 863         td->ts.stat_io_bytes[0] = td->ts.stat_io_bytes[1] = 0;
 864         td->this_io_bytes[0] = td->this_io_bytes[1] = 0;
 865         td->zone_bytes = 0;
 866         td->rate_bytes = 0;
 867         td->rate_blocks = 0;
 868         td->rw_end_set[0] = td->rw_end_set[1] = 0;
 869
 870         td->last_was_sync = 0;
 871
 872         /*
 873          * reset file done count if we are to start over
 874          */
 875         if (td->o.time_based || td->o.loops)
 876                 td->nr_done_files = 0;
 877 }
 878
 879 void reset_all_stats(struct thread_data *td)
 880 {
 881         struct timeval tv;
 882         int i;
 883
 884         reset_io_counters(td);
 885
 886         for (i = 0; i < 2; i++) {
 887                 td->io_bytes[i] = 0;
 888                 td->io_blocks[i] = 0;
 889                 td->io_issues[i] = 0;
 890                 td->ts.total_io_u[i] = 0;
 891         }
 892
 893         fio_gettime(&tv, NULL);
 894         memcpy(&td->epoch, &tv, sizeof(tv));
 895         memcpy(&td->start, &tv, sizeof(tv));
 896 }
 897
 898 static int clear_io_state(struct thread_data *td)
 899 {
 900         struct fio_file *f;
 901         unsigned int i;
 902         int ret;
 903
 904         reset_io_counters(td);
 905
 906         close_files(td);
 907
 908         ret = 0;
 909         for_each_file(td, f, i) {
 910                 f->flags &= ~FIO_FILE_DONE;
 911                 ret = td_io_open_file(td, f);
 912                 if (ret)
 913                         break;
 914         }
 915
 916         return ret;
 917 }
 918
 919 /*
 920  * Entry point for the thread based jobs. The process based jobs end up
 921  * here as well, after a little setup.
 922  */
 923 static void *thread_main(void *data)
 924 {
 925         unsigned long long runtime[2], elapsed;
 926         struct thread_data *td = data;
 927         int clear_state;
 928
 929         if (!td->o.use_thread)
 930                 setsid();
 931
 932         td->pid = getpid();
 933
 934         dprint(FD_PROCESS, "jobs pid=%d started\n", (int) td->pid);
 935
 936         INIT_FLIST_HEAD(&td->io_u_freelist);
 937         INIT_FLIST_HEAD(&td->io_u_busylist);
 938         INIT_FLIST_HEAD(&td->io_u_requeues);
 939         INIT_FLIST_HEAD(&td->io_log_list);
 940         INIT_FLIST_HEAD(&td->io_hist_list);
 941         td->io_hist_tree = RB_ROOT;
 942
 943         td_set_runstate(td, TD_INITIALIZED);
 944         fio_mutex_up(startup_mutex);
 945         fio_mutex_down(td->mutex);
 946
 947         /*
 948          * the ->mutex mutex is now no longer used, close it to avoid
 949          * eating a file descriptor
 950          */
 951         fio_mutex_remove(td->mutex);
 952
 953         /*
 954          * May alter parameters that init_io_u() will use, so we need to
 955          * do this first.
 956          */
 957         if (init_iolog(td))
 958                 goto err;
 959
 960         if (init_io_u(td))
 961                 goto err;
 962
 963         if (td->o.cpumask_set && fio_setaffinity(td) == -1) {
 964                 td_verror(td, errno, "cpu_set_affinity");
 965                 goto err;
 966         }
 967
 968         /*
 969          * If we have a gettimeofday() thread, make sure we exclude that
 970          * thread from this job
 971          */
 972         if (td->o.gtod_cpu) {
 973                 fio_cpu_clear(&td->o.cpumask, td->o.gtod_cpu);
 974                 if (fio_setaffinity(td) == -1) {
 975                         td_verror(td, errno, "cpu_set_affinity");
 976                         goto err;
 977                 }
 978         }
 979
 980         if (td->ioprio_set) {
 981                 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, td->ioprio) == -1) {
 982                         td_verror(td, errno, "ioprio_set");
 983                         goto err;
 984                 }
 985         }
 986
 987         if (nice(td->o.nice) == -1) {
 988                 td_verror(td, errno, "nice");
 989                 goto err;
 990         }
 991
 992         if (td->o.ioscheduler && switch_ioscheduler(td))
 993                 goto err;
 994
 995         if (!td->o.create_serialize && setup_files(td))
 996                 goto err;
 997
 998         if (td_io_init(td))
 999                 goto err;
1000
1001         if (open_files(td))
1002                 goto err;
1003
1004         if (init_random_map(td))
1005                 goto err;
1006
1007         if (td->o.exec_prerun) {
1008                 if (system(td->o.exec_prerun) < 0)
1009                         goto err;
1010         }
1011
1012         fio_gettime(&td->epoch, NULL);
1013         getrusage(RUSAGE_SELF, &td->ts.ru_start);
1014
1015         runtime[0] = runtime[1] = 0;
1016         clear_state = 0;
1017         while (keep_running(td)) {
1018                 fio_gettime(&td->start, NULL);
1019                 memcpy(&td->ts.stat_sample_time, &td->start, sizeof(td->start));
1020                 memcpy(&td->tv_cache, &td->start, sizeof(td->start));
1021
1022                 if (td->o.ratemin)
1023                         memcpy(&td->lastrate, &td->ts.stat_sample_time,
1024                                                         sizeof(td->lastrate));
1025
1026                 if (clear_state && clear_io_state(td))
1027                         break;
1028
1029                 prune_io_piece_log(td);
1030
1031                 do_io(td);
1032
1033                 clear_state = 1;
1034
1035                 if (td_read(td) && td->io_bytes[DDIR_READ]) {
1036                         if (td->rw_end_set[DDIR_READ])
1037                                 elapsed = utime_since(&td->start,
1038                                                       &td->rw_end[DDIR_READ]);
1039                         else
1040                                 elapsed = utime_since_now(&td->start);
1041
1042                         runtime[DDIR_READ] += elapsed;
1043                 }
1044                 if (td_write(td) && td->io_bytes[DDIR_WRITE]) {
1045                         if (td->rw_end_set[DDIR_WRITE])
1046                                 elapsed = utime_since(&td->start,
1047                                                       &td->rw_end[DDIR_WRITE]);
1048                         else
1049                                 elapsed = utime_since_now(&td->start);
1050
1051                         runtime[DDIR_WRITE] += elapsed;
1052                 }
1053
1054                 if (td->error || td->terminate)
1055                         break;
1056
1057                 if (!td->o.do_verify ||
1058                     td->o.verify == VERIFY_NONE ||
1059                     (td->io_ops->flags & FIO_UNIDIR))
1060                         continue;
1061
1062                 if (clear_io_state(td))
1063                         break;
1064
1065                 fio_gettime(&td->start, NULL);
1066
1067                 do_verify(td);
1068
1069                 runtime[DDIR_READ] += utime_since_now(&td->start);
1070
1071                 if (td->error || td->terminate)
1072                         break;
1073         }
1074
1075         update_rusage_stat(td);
1076         td->ts.runtime[0] = (runtime[0] + 999) / 1000;
1077         td->ts.runtime[1] = (runtime[1] + 999) / 1000;
1078         td->ts.total_run_time = mtime_since_now(&td->epoch);
1079         td->ts.io_bytes[0] = td->io_bytes[0];
1080         td->ts.io_bytes[1] = td->io_bytes[1];
1081
1082         if (td->ts.bw_log) {
1083                 if (td->o.bw_log_file) {
1084                         finish_log_named(td, td->ts.bw_log,
1085                                                 td->o.bw_log_file, "bw");
1086                 } else
1087                         finish_log(td, td->ts.bw_log, "bw");
1088         }
1089         if (td->ts.slat_log) {
1090                 if (td->o.lat_log_file) {
1091                         finish_log_named(td, td->ts.slat_log,
1092                                                 td->o.lat_log_file, "clat");
1093                 } else
1094                         finish_log(td, td->ts.slat_log, "slat");
1095         }
1096         if (td->ts.clat_log) {
1097                 if (td->o.lat_log_file) {
1098                         finish_log_named(td, td->ts.clat_log,
1099                                                 td->o.lat_log_file, "clat");
1100                 } else
1101                         finish_log(td, td->ts.clat_log, "clat");
1102         }
1103         if (td->o.exec_postrun) {
1104                 if (system(td->o.exec_postrun) < 0)
1105                         log_err("fio: postrun %s failed\n", td->o.exec_postrun);
1106         }
1107
1108         if (exitall_on_terminate)
1109                 terminate_threads(td->groupid);
1110
1111 err:
1112         if (td->error)
1113                 printf("fio: pid=%d, err=%d/%s\n", (int) td->pid, td->error,
1114                                                         td->verror);
1115         close_and_free_files(td);
1116         close_ioengine(td);
1117         cleanup_io_u(td);
1118
1119         if (td->o.cpumask_set)
1120                 fio_cpuset_exit(td);
1121
1122         /*
1123          * do this very late, it will log file closing as well
1124          */
1125         if (td->o.write_iolog_file)
1126                 write_iolog_close(td);
1127
1128         options_mem_free(td);
1129         td_set_runstate(td, TD_EXITED);
1130         return (void *) (unsigned long) td->error;
1131 }
1132
1133 /*
1134  * We cannot pass the td data into a forked process, so attach the td and
1135  * pass it to the thread worker.
1136  */
1137 static int fork_main(int shmid, int offset)
1138 {
1139         struct thread_data *td;
1140         void *data, *ret;
1141
1142         data = shmat(shmid, NULL, 0);
1143         if (data == (void *) -1) {
1144                 int __err = errno;
1145
1146                 perror("shmat");
1147                 return __err;
1148         }
1149
1150         td = data + offset * sizeof(struct thread_data);
1151         ret = thread_main(td);
1152         shmdt(data);
1153         return (int) (unsigned long) ret;
1154 }
1155
1156 /*
1157  * Run over the job map and reap the threads that have exited, if any.
1158  */
1159 static void reap_threads(int *nr_running, int *t_rate, int *m_rate)
1160 {
1161         struct thread_data *td;
1162         int i, cputhreads, realthreads, pending, status, ret;
1163
1164         /*
1165          * reap exited threads (TD_EXITED -> TD_REAPED)
1166          */
1167         realthreads = pending = cputhreads = 0;
1168         for_each_td(td, i) {
1169                 int flags = 0;
1170
1171                 /*
1172                  * ->io_ops is NULL for a thread that has closed its
1173                  * io engine
1174                  */
1175                 if (td->io_ops && !strcmp(td->io_ops->name, "cpuio"))
1176                         cputhreads++;
1177                 else
1178                         realthreads++;
1179
1180                 if (!td->pid) {
1181                         pending++;
1182                         continue;
1183                 }
1184                 if (td->runstate == TD_REAPED)
1185                         continue;
1186                 if (td->o.use_thread) {
1187                         if (td->runstate == TD_EXITED) {
1188                                 td_set_runstate(td, TD_REAPED);
1189                                 goto reaped;
1190                         }
1191                         continue;
1192                 }
1193
1194                 flags = WNOHANG;
1195                 if (td->runstate == TD_EXITED)
1196                         flags = 0;
1197
1198                 /*
1199                  * check if someone quit or got killed in an unusual way
1200                  */
1201                 ret = waitpid(td->pid, &status, flags);
1202                 if (ret < 0) {
1203                         if (errno == ECHILD) {
1204                                 log_err("fio: pid=%d disappeared %d\n",
1205                                                 (int) td->pid, td->runstate);
1206                                 td_set_runstate(td, TD_REAPED);
1207                                 goto reaped;
1208                         }
1209                         perror("waitpid");
1210                 } else if (ret == td->pid) {
1211                         if (WIFSIGNALED(status)) {
1212                                 int sig = WTERMSIG(status);
1213
1214                                 if (sig != SIGQUIT)
1215                                         log_err("fio: pid=%d, got signal=%d\n",
1216                                                         (int) td->pid, sig);
1217                                 td_set_runstate(td, TD_REAPED);
1218                                 goto reaped;
1219                         }
1220                         if (WIFEXITED(status)) {
1221                                 if (WEXITSTATUS(status) && !td->error)
1222                                         td->error = WEXITSTATUS(status);
1223
1224                                 td_set_runstate(td, TD_REAPED);
1225                                 goto reaped;
1226                         }
1227                 }
1228
1229                 /*
1230                  * thread is not dead, continue
1231                  */
1232                 pending++;
1233                 continue;
1234 reaped:
1235                 (*nr_running)--;
1236                 (*m_rate) -= td->o.ratemin;
1237                 (*t_rate) -= td->o.rate;
1238                 if (!td->pid)
1239                         pending--;
1240
1241                 if (td->error)
1242                         exit_value++;
1243
1244                 done_secs += mtime_since_now(&td->epoch) / 1000;
1245         }
1246
1247         if (*nr_running == cputhreads && !pending && realthreads)
1248                 terminate_threads(TERMINATE_ALL);
1249 }
1250
1251 static void *gtod_thread_main(void *data)
1252 {
1253         fio_mutex_up(startup_mutex);
1254
1255         /*
1256          * As long as we have jobs around, update the clock. It would be nice
1257          * to have some way of NOT hammering that CPU with gettimeofday(),
1258          * but I'm not sure what to use outside of a simple CPU nop to relax
1259          * it - we don't want to lose precision.
1260          */
1261         while (threads) {
1262                 fio_gtod_update();
1263                 nop;
1264         }
1265
1266         return NULL;
1267 }
1268
1269 static int fio_start_gtod_thread(void)
1270 {
1271         if (pthread_create(&gtod_thread, NULL, gtod_thread_main, NULL)) {
1272                 perror("Can't create gtod thread");
1273                 return 1;
1274         }
1275         if (pthread_detach(gtod_thread) < 0) {
1276                 perror("Can't detatch gtod thread");
1277                 return 1;
1278         }
1279
1280         fio_mutex_down(startup_mutex);
1281         return 0;
1282 }
1283
1284 /*
1285  * Main function for kicking off and reaping jobs, as needed.
1286  */
1287 static void run_threads(void)
1288 {
1289         struct thread_data *td;
1290         unsigned long spent;
1291         int i, todo, nr_running, m_rate, t_rate, nr_started;
1292
1293         if (fio_pin_memory())
1294                 return;
1295
1296         if (fio_gtod_offload && fio_start_gtod_thread())
1297                 return;
1298
1299         if (!terse_output) {
1300                 printf("Starting ");
1301                 if (nr_thread)
1302                         printf("%d thread%s", nr_thread,
1303                                                 nr_thread > 1 ? "s" : "");
1304                 if (nr_process) {
1305                         if (nr_thread)
1306                                 printf(" and ");
1307                         printf("%d process%s", nr_process,
1308                                                 nr_process > 1 ? "es" : "");
1309                 }
1310                 printf("\n");
1311                 fflush(stdout);
1312         }
1313
1314         set_sig_handlers();
1315
1316         todo = thread_number;
1317         nr_running = 0;
1318         nr_started = 0;
1319         m_rate = t_rate = 0;
1320
1321         for_each_td(td, i) {
1322                 print_status_init(td->thread_number - 1);
1323
1324                 if (!td->o.create_serialize) {
1325                         init_disk_util(td);
1326                         continue;
1327                 }
1328
1329                 /*
1330                  * do file setup here so it happens sequentially,
1331                  * we don't want X number of threads getting their
1332                  * client data interspersed on disk
1333                  */
1334                 if (setup_files(td)) {
1335                         exit_value++;
1336                         if (td->error)
1337                                 log_err("fio: pid=%d, err=%d/%s\n",
1338                                         (int) td->pid, td->error, td->verror);
1339                         td_set_runstate(td, TD_REAPED);
1340                         todo--;
1341                 } else {
1342                         struct fio_file *f;
1343                         unsigned int i;
1344
1345                         /*
1346                          * for sharing to work, each job must always open
1347                          * its own files. so close them, if we opened them
1348                          * for creation
1349                          */
1350                         for_each_file(td, f, i)
1351                                 td_io_close_file(td, f);
1352                 }
1353
1354                 init_disk_util(td);
1355         }
1356
1357         set_genesis_time();
1358
1359         while (todo) {
1360                 struct thread_data *map[MAX_JOBS];
1361                 struct timeval this_start;
1362                 int this_jobs = 0, left;
1363
1364                 /*
1365                  * create threads (TD_NOT_CREATED -> TD_CREATED)
1366                  */
1367                 for_each_td(td, i) {
1368                         if (td->runstate != TD_NOT_CREATED)
1369                                 continue;
1370
1371                         /*
1372                          * never got a chance to start, killed by other
1373                          * thread for some reason
1374                          */
1375                         if (td->terminate) {
1376                                 todo--;
1377                                 continue;
1378                         }
1379
1380                         if (td->o.start_delay) {
1381                                 spent = mtime_since_genesis();
1382
1383                                 if (td->o.start_delay * 1000 > spent)
1384                                         continue;
1385                         }
1386
1387                         if (td->o.stonewall && (nr_started || nr_running)) {
1388                                 dprint(FD_PROCESS, "%s: stonewall wait\n",
1389                                                         td->o.name);
1390                                 break;
1391                         }
1392
1393                         /*
1394                          * Set state to created. Thread will transition
1395                          * to TD_INITIALIZED when it's done setting up.
1396                          */
1397                         td_set_runstate(td, TD_CREATED);
1398                         map[this_jobs++] = td;
1399                         nr_started++;
1400
1401                         if (td->o.use_thread) {
1402                                 dprint(FD_PROCESS, "will pthread_create\n");
1403                                 if (pthread_create(&td->thread, NULL,
1404                                                    thread_main, td)) {
1405                                         perror("pthread_create");
1406                                         nr_started--;
1407                                         break;
1408                                 }
1409                                 if (pthread_detach(td->thread) < 0)
1410                                         perror("pthread_detach");
1411                         } else {
1412                                 pid_t pid;
1413                                 dprint(FD_PROCESS, "will fork\n");
1414                                 pid = fork();
1415                                 if (!pid) {
1416                                         int ret = fork_main(shm_id, i);
1417
1418                                         _exit(ret);
1419                                 } else if (i == fio_debug_jobno)
1420                                         *fio_debug_jobp = pid;
1421                         }
1422                         fio_mutex_down(startup_mutex);
1423                 }
1424
1425                 /*
1426                  * Wait for the started threads to transition to
1427                  * TD_INITIALIZED.
1428                  */
1429                 fio_gettime(&this_start, NULL);
1430                 left = this_jobs;
1431                 while (left && !fio_abort) {
1432                         if (mtime_since_now(&this_start) > JOB_START_TIMEOUT)
1433                                 break;
1434
1435                         usleep(100000);
1436
1437                         for (i = 0; i < this_jobs; i++) {
1438                                 td = map[i];
1439                                 if (!td)
1440                                         continue;
1441                                 if (td->runstate == TD_INITIALIZED) {
1442                                         map[i] = NULL;
1443                                         left--;
1444                                 } else if (td->runstate >= TD_EXITED) {
1445                                         map[i] = NULL;
1446                                         left--;
1447                                         todo--;
1448                                         nr_running++; /* work-around... */
1449                                 }
1450                         }
1451                 }
1452
1453                 if (left) {
1454                         log_err("fio: %d jobs failed to start\n", left);
1455                         for (i = 0; i < this_jobs; i++) {
1456                                 td = map[i];
1457                                 if (!td)
1458                                         continue;
1459                                 kill(td->pid, SIGTERM);
1460                         }
1461                         break;
1462                 }
1463
1464                 /*
1465                  * start created threads (TD_INITIALIZED -> TD_RUNNING).
1466                  */
1467                 for_each_td(td, i) {
1468                         if (td->runstate != TD_INITIALIZED)
1469                                 continue;
1470
1471                         if (in_ramp_time(td))
1472                                 td_set_runstate(td, TD_RAMP);
1473                         else
1474                                 td_set_runstate(td, TD_RUNNING);
1475                         nr_running++;
1476                         nr_started--;
1477                         m_rate += td->o.ratemin;
1478                         t_rate += td->o.rate;
1479                         todo--;
1480                         fio_mutex_up(td->mutex);
1481                 }
1482
1483                 reap_threads(&nr_running, &t_rate, &m_rate);
1484
1485                 if (todo)
1486                         usleep(100000);
1487         }
1488
1489         while (nr_running) {
1490                 reap_threads(&nr_running, &t_rate, &m_rate);
1491                 usleep(10000);
1492         }
1493
1494         update_io_ticks();
1495         fio_unpin_memory();
1496 }
1497
1498 int main(int argc, char *argv[])
1499 {
1500         long ps;
1501
1502         sinit();
1503
1504         /*
1505          * We need locale for number printing, if it isn't set then just
1506          * go with the US format.
1507          */
1508         if (!getenv("LC_NUMERIC"))
1509                 setlocale(LC_NUMERIC, "en_US");
1510
1511         if (parse_options(argc, argv))
1512                 return 1;
1513
1514         if (!thread_number)
1515                 return 0;
1516
1517         ps = sysconf(_SC_PAGESIZE);
1518         if (ps < 0) {
1519                 log_err("Failed to get page size\n");
1520                 return 1;
1521         }
1522
1523         page_size = ps;
1524         page_mask = ps - 1;
1525
1526         if (write_bw_log) {
1527                 setup_log(&agg_io_log[DDIR_READ]);
1528                 setup_log(&agg_io_log[DDIR_WRITE]);
1529         }
1530
1531         startup_mutex = fio_mutex_init(0);
1532
1533         set_genesis_time();
1534
1535         status_timer_arm();
1536
1537         run_threads();
1538
1539         if (!fio_abort) {
1540                 show_run_stats();
1541                 if (write_bw_log) {
1542                         __finish_log(agg_io_log[DDIR_READ], "agg-read_bw.log");
1543                         __finish_log(agg_io_log[DDIR_WRITE],
1544                                         "agg-write_bw.log");
1545                 }
1546         }
1547
1548         fio_mutex_remove(startup_mutex);
1549         return exit_value;
1550 }